A unique landscape shaped by the wind and sand
The Landes coast is renowned for its vast beaches and wild landscapes, where dunes play a key role in the natural balance of the coastline. Among them, the Dune of Pilat, Located a few kilometers from Biscarrosse, it is the highest in Europe. A true sand giant, it impresses with its 106 meters high, his 2.9 km long and its 500 meters wide. But how did such a natural wonder come to be?
The origin of the Dune of Pilat
The formation of the Dune du Pilat is the result of a natural phenomenon linked to the Banc d'Arguin, which began some time ago. thousands of years. Its story is linked to three main elements:
🌞 The sand It originates from the erosion of the rocks of the Pyrenees, transported by rivers to the ocean, then deposited on the coast by waves and sea currents.
🌞 The wind It plays an essential role by pushing the accumulated sand inland, gradually forming the dune.
🌞 Vegetation Normally, dunes are stabilized by vegetation, but here, the absence of trees and plants on the seafront has allowed the sand to continue its advance.
The result? A dune in perpetual motion, which advances by approximately 1 to 5 meters per year towards the Landes forest!
The Dune is located 20km from Biscarrosse Plage, via roads and magnificent viewpoints.
The dunes of Biscarrosse: a natural barrier against the ocean
In Biscarrosse, as along the entire Landes coast, the dunes play a crucial role. They protect the inland areas from marine erosion and storms. These sand formations are classified into three types:
The embryonic dunes Small dunes along the beach, constantly evolving.
The vibrant dunes : Devoid of vegetation, they move under the effect of the wind.
The dunes are fixed. Stabilized by plants such as’oyat, They form a solid barrier against erosion.
But this fragile balance is threatened by erosion and human pressure. That's why... protective actions measures are being implemented, such as planting marram grass or installing chestnut stakes to limit the movement of the sand.
Preserve this unique natural heritage
Whether at the Dune du Pilat or on the beaches of Biscarrosse, it is essential to respect these fragile ecosystems:
🌿 Stay on the marked trails to avoid trampling the vegetation that stabilizes the sand.
🚯 Do not leave any waste which could harm local biodiversity.
🚶♂️ Prioritize accessible routes to avoid accelerating erosion.
Reprofiling: a solution to erosion
For what ?
To combat wind erosion (the sand that accumulates behind the dunes, threatening roads and homes). The objective is also to harmonize the levels between the white dune (mobile) and the grassed (stabilized) dune.
How ?
By reshaping the dune through operations of reprofiling :
- Top skimming
- Redesign of the slopes
- Dune stabilization using branches
- Replanting marram grass to stabilize it
📅 When ?
These operations take place between January and the end of March.
The Landes dunes are a precious heritage, shaped by millennia of winds and tides. It's up to us to protect them so that future generations can continue to enjoy them! 🌊🏄♂️